The 11 and 12-year-olds showed how they mixed glue
, food colouring and borax to create the brightly coloured goo.
A second was mixed glue
and wood failure at the joint line, which produced a mean stress of 2,275 psi.
Use of isocyanate adhesive increased the IB strength properties of the 0.125- and 0.167-inch veneer thickness 2-ply test samples to that of the 0.100-inch veneer thickness 2-ply test samples bonded with PF mixed glue. The IB values for the PF-bonded birch test samples averaged 346 psi.
The tension values for the 0.125- and 0.167-inch veneer thickness 2-ply test lap joint samples bonded with isocyanate adhesive increased at a greater initial rate than attained with the PF mixed glue (Figs.
The mixed glue
was then spread on one surface of the bamboo strips with a hand roller.